PHP致命错误：在非对象中调用成员函数getScore（）

this is my first question

I Have following class

class ProDetection {
public function ProDetection ( ) { }
public function detect($word) {
    ............
}
public function getScore() {
    return $score;
}
}

class SaveDetection {
public function SaveDetection($words) {
    $proDetection = new ProDetection();
    for($i=0;$i<sizeof($words);$i++) {
        $proDetection->detect($words[$i]);
    }
}
public function getScore() {
    return $this->proDetection->getScore();\\line 22
}
}

in other PHP file, i'm try to calling SaveDetection to getScore();

$konten = "xxxx xxxx xxx";
$save = new SaveDetection($konten);
print_r( $save->getScore() );

But i got an error message

Notice: Undefined property: SaveDetection::$proDetection in C:\xampp\htdocs\inovasi\SaveDetection.php on line 22

Fatal error: Call to a member function getScore() on a non-object in C:\xampp\htdocs\inovasi\SaveDetection.php on line 22

Please need your help

Try this. Declare your variables as private (Coz if your code grows, it is hard to find what all the object or variables are used in the class.)

class SaveDetection {
    private $proDetection = null;
    public function __construct($words) {
        $this->proDetection = new ProDetection();
        for($i=0;$i<sizeof($words);$i++) {
            $this->proDetection->detect($words[$i]);
        }
    }
    public function getScore() {
        return $this->proDetection->getScore();\\line 22
    }

    private $proDetection;

}

You never declare the the $proDetection member variable. Basically in your SaveDetection constructor you are declaring $proDetection as a local variable

class SaveDetection {

    public function SaveDetection($words) {
        $this->proDetection = new ProDetection();
        for($i=0;$i<sizeof($words);$i++) {
            $this->proDetection->detect($words[$i]);
        }
    }
    public function getScore() {
        return $this->proDetection->getScore();\\line 22
    }

    private $proDetection;

}

EDIT:

PS. You should really use PHP's __construct() syntax instead of the old style of constructors. See here.

class SaveDetection {

    public function __construct($words) {
        $this->proDetection = new ProDetection();
        for($i=0;$i<sizeof($words);$i++) {
            $this->proDetection->detect($words[$i]);
        }
    }